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A364803
as a simple table
n
a(n)
0
0
1
4
2
5
3
6
4
7
5
10
6
14
7
23
8
46
9
117
10
442
11
3006
12
47983
13
2839934
14
918486751
15
3769839124330
[0,4,5,6,7,10,14,23,46,117,442,3006,47983,2839934, 918486751,3769839124330]